PRODUCT DETAILS
Honda K/L Series Thermostat Housing Mounting Bolt - Genuine OEM (90051-PNA-000)
Be honest, when you did your thermostat you reached for whatever M6 bolt was rattling around in the coffee can, didn't you? We've all done it. But this is the spot to use the right one, and this is it: the genuine Honda thermostat housing bolt, part 90051-PNA-000, in the exact M6 x 28mm size your engine actually wants. It's the bolt that mounts the thermostat housing, the back half of the thermostat assembly, to the block, and it threads straight into aluminum, which is exactly why "close enough" can come back to bite you.
Why The Right Bolt Actually Matters Here
Here's the deal with grabbing a random bolt for this job. The thermostat housing threads into the aluminum on your engine, and aluminum threads aren't forgiving. Run a bolt that's too long and it bottoms out before the housing's clamped down, so it never seats right and you end up chasing a coolant leak. Too short and you don't get enough thread to hold it properly. Wrong thread or the wrong type and you can cross-thread or strip those aluminum threads, and now a five-dollar bolt just turned into a much bigger, more expensive headache. The 28mm length on this one is what it's supposed to be, so the housing pulls down flat and seals like it should. Just use the right bolt and skip the drama.
Genuine Honda, Sized Right, Fits A Bunch Of Engines
This is the real Honda piece, M6 x 28mm, and it's shared across a big lineup of K-series and L-series Hondas, so it's a handy one to have when you're doing a thermostat or chasing a housing leak. Since it's OEM, the size and threads are exactly what your engine was built around, it goes in clean and torques down right, no guessing and no hardware-store gamble.
What You Get
- Genuine Honda thermostat housing mounting bolt (90051-PNA-000)
- M6 x 28mm
- Mounts the thermostat housing to the engine block
- Direct OEM replacement, correct size and threads
- Fits a wide range of K-series and L-series engines
- Sold individually
Fits These Cars
- 2013-2015 Acura ILX
- 2002-2006 Acura RSX Base/Type S
- 2004-2014 Acura TSX
- 2003-2012 Honda Accord
- 2002-2015 Honda Civic Si
- 2002-2014 Honda CR-V
- 2011-2016 Honda CR-Z
- 2012-2015 Honda Crosstour
- 2003-2011 Honda Element
- 2009-2014 Honda Fit
- 2010-2014 Honda Insight
Note: Genuine Honda thermostat housing mounting bolt, part number 90051-PNA-000, sized M6 x 28mm. This is the specific bolt that mounts the thermostat housing (the back portion of the thermostat assembly) to the engine block, threading into aluminum where a wrong-length or wrong-type bolt can fail to seat, leak, or strip the threads. Using the correct 28mm bolt lets the housing pull down flat and seal properly. Fits a range of K-series and L-series engines, including the 2013-2015 Acura ILX, 2002-2006 Acura RSX Base/Type S, 2004-2014 Acura TSX, 2003-2012 Honda Accord, 2002-2015 Honda Civic Si, 2002-2014 Honda CR-V, 2011-2016 Honda CR-Z, 2012-2015 Honda Crosstour, 2003-2011 Honda Element, 2009-2014 Honda Fit, and 2010-2014 Honda Insight. Direct OEM replacement with factory-correct size and threads. Sold individually. One bolt per order.